Kids are the hope of our planet.

In the belief that every day, not just April 22, should be Earth Day, we take a look at new books packed with ideas about recycling, reusing and otherwise going green. 101 Ways You Can Help Save the Planet Before You're 12! (Lark, 143 pages, $14.95, ages 7 to 10) Among the suggestions from author Joanne O'Sullivan: Build a house for bats (one of nature's pest controllers), take your parents to a green expo (dates and locations listed), make a bin for worms (living garbage disposers), and 98 more. The text is brief and fun to read, and the color photographs are lively. Earth in the Hot Seat: Bulletins From a Warming World (National Geographic Children's, 64 pages, $19.95, ages 9 to 12) Author Marfe Ferguson Delano describes the dangers of global warming in a magazine-style book that includes a quiz, conservation tips and directions for reducing your carbon footprint. Just Grace Goes Green (Houghton Mifflin, 192 pages, $16, ages 6 to 10) The fourth in Charise Mericle Harper's Just Grace series, the title combines the precocious third-grader's escapades with her zealous quest to save Earth. Love Your World (DK, 32 pages, $8.99, ages 2 to 4) The rhyming picture book, with lots of photos of toddlers, introduces concepts of reusing and recycling. The New 50 Simple Things Kids Can Do To Save the Earth (Andrews McMeel, 208 pages, $12.99, age 8 and older) The best-selling environmental book, first published in 1990, has been updated with new information and websites. In addition to hands-on projects, many scientific explanations are provided by the authors: environmental activist John Javna and his 15-year-old daughter, Sophie. Recycle This Book: 100 Top Children's Book Authors Tell You How To Go Green (Yearling, 267 pages, $5.99, age 10 and older) With titles such as Since We Can't Stop Moose From Belching, Drinking Dog Water and Poop Power, these short essays will grab young readers' attention and provide ideas as well as entertainment. Among the authors: Andrew Clements, Bruce Coville, Lois Duncan, Daniel Pinkwater, Jack Prelutsky, Jerry Spinelli and Henry (Fonzie) Winkler.